Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v2.4.0.8
Stock-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 9 Months Ended
Oct. 06, 2013
Sep. 30, 2012
Stock Options
    
Weighted-average fair value of non-qualified stock options and the related assumptions used in the pricing model    
Risk-free interest rate (as a percent) 0.70% 0.70%
Expected years until exercise 4 years 2 months 12 days 4 years 1 month 6 days
Expected stock volatility (as a percent) 44.40% 52.80%
Dividend yield (as a percent) 0.00% 0.00%
Weighted average Black-Scholes fair value per share at date of grant (in dollars per share) $ 15.19 $ 14.60
Shares    
Outstanding, beginning of period (in shares) 705  
Granted (in shares) 129  
Options Exercised (in shares) (264)  
Cancelled (in shares) (44)  
Outstanding, end of period (in shares) 526  
Restricted Stock Units
    
Shares    
Outstanding, beginning of period (in shares) 180  
Granted (in shares) 72  
Units Vested (in shares) (104)  
Cancelled (in shares) (9)  
Outstanding, end of period (in shares) 139  
Restricted Stock
    
Shares    
Outstanding, beginning of period (in shares) 4  
Units Vested (in shares) (4)  
Performance Stock Units
    
Shares    
Outstanding, beginning of period (in shares) 35  
Granted (in shares) 6  
Units Vested (in shares) (41)